18981573307 has 2 divisors, whose sum is σ = 18981573308. Its totient is φ = 18981573306.

The previous prime is 18981573301. The next prime is 18981573341. The reversal of 18981573307 is 70337518981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18981573307 is a prime.

It is not a weakly prime, because it can be changed into another prime (18981573301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9490786653 + 9490786654.

It is an arithmetic number, because the mean of its divisors is an integer number (9490786654).

Almost surely, 2^18981573307 is an apocalyptic number.

18981573307 is a deficient number, since it is larger than the sum of its proper divisors (1).

18981573307 is an equidigital number, since it uses as much as digits as its factorization.

18981573307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 18981573307 in words is "eighteen billion, nine hundred eighty-one million, five hundred seventy-three thousand, three hundred seven".